On Fri, 16 Dec 2022, Imre Deak <imre.deak@xxxxxxxxx> wrote: > On Fri, Dec 16, 2022 at 06:10:39PM +0200, Jani Nikula wrote: >> On Fri, 16 Dec 2022, Imre Deak <imre.deak@xxxxxxxxx> wrote: >> > On Wed, Dec 14, 2022 at 04:41:42PM -0500, Lyude Paul wrote: >> >> For the whole series: >> >> >> >> Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx> >> > >> > Thanks for the review, pushed it to drm-misc-next. >> >> Hmm, with the drm-misc *not* cherry-picking patches from drm-misc-next >> to drm-misc-fixes, these will only get backported to stable kernels >> after they hit Linus' tree in the next (as opposed to current) merge >> window after a full development cycle. Wonder if they should be >> expedited. > > Ok, it should've been pushed to -fixes then, will do that next time. > Yes, I think sending them already before the next merge window would be > good. Cc: drm-misc maintainers, I think this is for you to figure out. BR, Jani. > >> >> BR, >> Jani. >> >> > >> >> Thanks! >> >> >> >> On Wed, 2022-12-14 at 20:42 +0200, Imre Deak wrote: >> >> > If the sink gets disconnected during receiving a multi-packet DP MST AUX >> >> > down-reply/up-request sideband message, the state keeping track of which >> >> > packets have been received already is not reset. This results in a failed >> >> > sanity check for the subsequent message packet received after a sink is >> >> > reconnected (due to the pending message not yet completed with an >> >> > end-of-message-transfer packet), indicated by the >> >> > >> >> > "sideband msg set header failed" >> >> > >> >> > error. >> >> > >> >> > Fix the above by resetting the up/down message reception state after a >> >> > disconnect event. >> >> > >> >> > Cc: Lyude Paul <lyude@xxxxxxxxxx> >> >> > Cc: <stable@xxxxxxxxxxxxxxx> # v3.17+ >> >> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> >> >> > --- >> >> > drivers/gpu/drm/display/drm_dp_mst_topology.c | 3 +++ >> >> > 1 file changed, 3 insertions(+) >> >> > >> >> > diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c >> >> > index 51a46689cda70..90819fff2c9ba 100644 >> >> > --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c >> >> > +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c >> >> > @@ -3641,6 +3641,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms >> >> > drm_dp_dpcd_writeb(mgr->aux, DP_MSTM_CTRL, 0); >> >> > ret = 0; >> >> > mgr->payload_id_table_cleared = false; >> >> > + >> >> > + memset(&mgr->down_rep_recv, 0, sizeof(mgr->down_rep_recv)); >> >> > + memset(&mgr->up_req_recv, 0, sizeof(mgr->up_req_recv)); >> >> > } >> >> > >> >> > out_unlock: >> >> >> >> -- >> >> Cheers, >> >> Lyude Paul (she/her) >> >> Software Engineer at Red Hat >> >> >> >> -- >> Jani Nikula, Intel Open Source Graphics Center -- Jani Nikula, Intel Open Source Graphics Center
